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sensors Mode-S transponder

A0DDC4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N155LH · PIPER PA-28-140/150/160/180 · operated by FARMINGDALE STATE UNIVERSITY

Hex
A0DDC4
Octal
50156704
Decimal
10,542,532
Country
US
Tail
N155LH
Type
P28A
No current signal · last broadcast 13h ago
Flights observed
135
Distinct callsigns
1
Country
US
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S A0DDC4.

Country allocation

The ICAO 24-bit address A0DDC4 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 1 distinct

Callsign Airline Flights Last seen
FDL55 - 135 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-17 FDL55 - Jul 17, 21:44 UTCJul 17, 22:29 UTC45m
2026-07-17 FDL55 FRG → FRG Jul 17, 19:15 UTCJul 17, 20:20 UTC1h 5m
2026-07-17 FDL55 FRG → FRG Jul 17, 16:49 UTCJul 17, 18:10 UTC1h 20m
2026-07-17 FDL55 - Jul 17, 14:04 UTCJul 17, 15:29 UTC1h 25m
2026-07-16 FDL55 FRG → FRG Jul 16, 14:00 UTCJul 16, 15:00 UTC1h 0m
2026-07-15 FDL55 - Jul 15, 14:50 UTCJul 15, 15:15 UTC25m
2026-07-15 FDL55 - Jul 15, 13:10 UTCJul 15, 14:05 UTC55m
2026-07-15 FDL55 - Jul 15, 11:35 UTCJul 15, 12:20 UTC45m
2026-07-15 FDL55 - Jul 15, 03:25 UTCJul 15, 04:45 UTC1h 20m
2026-07-15 FDL55 - Jul 15, 01:20 UTCJul 15, 02:35 UTC1h 15m
2026-07-14 FDL55 - Jul 14, 19:35 UTCJul 14, 21:20 UTC1h 45m
2026-07-14 FDL55 - Jul 14, 17:05 UTCJul 14, 18:40 UTC1h 35m
2026-07-14 FDL55 FRG → FRG Jul 14, 14:00 UTCJul 14, 15:25 UTC1h 25m
2026-07-14 FDL55 - Jul 14, 11:40 UTCJul 14, 13:00 UTC1h 20m
2026-07-13 FDL55 - Jul 13, 22:35 UTCJul 13, 22:45 UTC10m
2026-07-13 FDL55 - Jul 13, 19:10 UTCJul 13, 21:05 UTC1h 55m
2026-07-13 FDL55 - Jul 13, 14:00 UTCJul 13, 15:00 UTC1h 0m
2026-07-10 FDL55 FRG → FRG Jul 10, 17:15 UTCJul 10, 18:35 UTC1h 20m
2026-07-10 FDL55 FRG → FRG Jul 10, 14:10 UTCJul 10, 15:30 UTC1h 20m
2026-07-09 FDL55 - Jul 9, 17:05 UTCJul 9, 17:55 UTC50m
2026-07-09 FDL55 FRG → FRG Jul 9, 14:00 UTCJul 9, 15:20 UTC1h 20m
2026-07-09 FDL55 FRG → FRG Jul 9, 11:30 UTCJul 9, 13:10 UTC1h 40m
2026-07-08 FDL55 - Jul 8, 22:10 UTCJul 8, 23:35 UTC1h 25m
2026-07-08 FDL55 - Jul 8, 19:15 UTCJul 8, 20:10 UTC55m
2026-07-08 FDL55 FRG → FRG Jul 8, 11:40 UTCJul 8, 13:10 UTC1h 30m
2026-07-05 FDL55 - Jul 5, 13:30 UTCJul 5, 14:35 UTC1h 5m
2026-07-03 FDL55 - Jul 3, 15:30 UTCJul 3, 16:10 UTC40m
2026-06-29 FDL55 - Jun 29, 19:35 UTCJun 29, 21:05 UTC1h 30m
2026-06-29 FDL55 - Jun 29, 16:59 UTCJun 29, 18:14 UTC1h 15m
2026-06-29 FDL55 FRG → FRG Jun 29, 13:49 UTCJun 29, 14:54 UTC1h 5m
2026-06-26 FDL55 FRG → FRG Jun 26, 19:55 UTCJun 26, 20:34 UTC40m
2026-06-26 FDL55 FRG → FRG Jun 26, 18:44 UTCJun 26, 18:54 UTC10m
2026-06-26 FDL55 FRG → FRG Jun 26, 12:10 UTCJun 26, 14:55 UTC2h 45m
2026-06-26 FDL55 FRG → FRG Jun 26, 01:29 UTCJun 26, 03:05 UTC1h 35m
2026-06-25 FDL55 - Jun 25, 19:34 UTCJun 25, 20:59 UTC1h 25m
2026-06-25 FDL55 - Jun 25, 16:35 UTCJun 25, 17:44 UTC1h 10m
2026-06-25 FDL55 FRG → FRG Jun 25, 14:20 UTCJun 25, 15:34 UTC1h 15m
2026-06-24 FDL55 - Jun 24, 22:14 UTCJun 24, 23:24 UTC1h 10m
2026-06-24 FDL55 - Jun 24, 19:04 UTCJun 24, 20:24 UTC1h 20m
2026-06-24 FDL55 - Jun 24, 14:00 UTCJun 24, 15:05 UTC1h 5m
2026-06-24 FDL55 FRG → FRG Jun 24, 11:29 UTCJun 24, 12:54 UTC1h 25m
2026-06-22 FDL55 FRG → FRG Jun 22, 16:40 UTCJun 22, 16:50 UTC10m
2026-06-22 FDL55 FRG → FRG Jun 22, 14:05 UTCJun 22, 14:59 UTC55m
2026-06-19 FDL55 FRG → FRG Jun 19, 11:24 UTCJun 19, 12:44 UTC1h 20m
2026-06-17 FDL55 FRG → FRG Jun 17, 19:25 UTCJun 17, 20:50 UTC1h 25m
2026-06-16 FDL55 - Jun 16, 16:50 UTCJun 16, 18:15 UTC1h 25m
2026-06-16 FDL55 - Jun 16, 14:00 UTCJun 16, 15:15 UTC1h 15m
2026-06-15 FDL55 FRG → FRG Jun 15, 19:20 UTCJun 15, 20:40 UTC1h 20m
2026-06-15 FDL55 FRG → FRG Jun 15, 16:45 UTCJun 15, 17:40 UTC55m
2026-06-15 FDL55 FRG → FRG Jun 15, 14:00 UTCJun 15, 15:00 UTC1h 0m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the N155LH page for operator, model, and routing details .

Mode-S A0DDC4 frequently asked

What is Mode-S code A0DDC4?
A0DDC4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N155LH.
Where is Mode-S A0DDC4 registered?
Mode-S code A0DDC4 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A0DDC4 broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0DDC4, octal 50156704, decimal 10,542,532.
What flights does A0DDC4 operate?
Mode-S A0DDC4 has broadcast 1 distinct callsign, including FDL55.